The identity string field and the tachyon vacuum

Ellwood, I., Feng, B., He, Y. & Moeller, N. (2001). The identity string field and the tachyon vacuum. Journal of High Energy Physics, 2001(016), doi: 10.1088/1126-6708/2001/07/016

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Abstract

We show that the triviality of the entire cohomology of the new BRST operator Q around the tachyon vacuum is equivalent to the Q-exactness of the identity I of the star-algebra. We use level truncation to show that as the level is increased, the identity becomes more accurately Q-exact. We carry our computations up to level nine, where an accuracy of 3% is attained. Our work supports, under a new light, Sen's conjecture concerning the absence of open string degrees of freedom around the tachyon vacuum. As a by-product, a new and simple expression for I in terms of Virasoro operators is found.

Item Type: Article
Additional Information: The original publication is available at http://iopscience.iop.org/1126-6708/2001/07/016/ archiveprefix: arXiv primaryclass: hep-th
Uncontrolled Keywords: Bosonic strings, BRST symmetry, gauge symmetry
Subjects: Q Science > QC Physics
Divisions: School of Engineering & Mathematical Sciences > Department of Mathematical Science
URI: http://openaccess.city.ac.uk/id/eprint/830

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